Kiln



April 13 1926. 1,530,483

H. F. GRUETZEMAQHER, JR

KILN

Filed Oct. 8, 1923 3 Sheets-Sheet 5 Patented Apr. 13, 1926.

' 1 UNITED STATES HENRY F.'GBUETZEM ACHER, J R., OF KIMMSWICK, MISSOURI, ASSIGNOR T0 GLENGOE LIME amateur-COMPANY, OF ST.

LOUIS, MISSOURI, A-CORPORA'IION OF MISSOURI.

KILN'.

Application 'filed October 8, 1923. Serial No. 667,334.

To alZwhom it mayconcern:

Be it known that I, HENRY F. Gnun'rzn- MAGHER, Jr., a citizen ofthe United States, and a resident of Kimmswick, Missouri, have inventedan Improvementin Kilns, of which the following is a specification.

This invention relates to kilns, and with regard to certain more specific features, to a lime kiln.

Among the several objects ofthe invention-may be'noted the provision of a simple and inexpensive control of the temperature and rate of flow of the air; and the provision of an eflicient and economical arrangement of parts for securing effective combustion of the fuel and thorough burning of the-contents of=the kiln. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the features of construction, steps and sequence of steps, combinations of elements and arrangements of parts, which are exemplified in the description hereinafter in connection with the accompanying drawings, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is illustrated diagrammatically One of various possible embodiments of the invention,

Fig. 1 is a front elevation, partly in central section, ofa kiln;

Fig. 2 is a side elevation of a portion of Fig. 1;

Fig.-3 Fig. 1;

Fig. 4 is a horizontal section on the line 4-4 of Fig. 1;

Fig. 5 is a vertical transverse section on the line 55 of Fig. 1; and

Fig. 6 is a vertical central longitudinal section of Fig. 3. 1

Similar reference characters indicate corresponding parts throughout the several views of the drawings. Figs. 2 to 6 are on a larger scale than Fig. 1.

Referring now more particularly to Fig. 1, there is illustrated a kiln mounted on a suitable foundation and adapted to receive within its fire-resistant walls 3 a charge of suitable material.

The wall or support 5 at the bottom, and cover 7 at the top, are preferably of concrete. The wall 9 at the central portion of the kiln is preferably of soft fire brick, suris a front elevation of a. portion of rounded for a portion of its length by aifill ingll of clay or mineral wool. The wall 13 at the upper portion of the kiln is preferablyof hard fire brick, surrounded by'a filling 15 of clay or mineral wool.

The fuel used is preferably gas, obtained from the producers 17, 19. The gas from the producers enters the kiln through the fines 21,23 (Figs. 1, 3 and 6) leading to the combustion chambers 25 (Figs. 1, 4, 5- and'6).

'Air from the outside atmosphere is taken into the apparatus (preferably forced in by a fan, not shown) at 27 (Figs. 1, 2, 3, '4 and 6). This air passes into a heating chamber 29 (Figs. 1, 4 and 6). In this heating chamber the'air is heated by conduction of heat from the interior of the kiln through the wall 31 (Fig. 4). This wall is 9 inches or so in thickness and has the required mechanical strength and fire resistant properties; and yet has a high enough thermal conductivity to heat the air in the chambers 29 to the desired extent.

From the heating chambers 29 the heated air is conducted through pipes 33 (Figs. 1, 2, 3 and 4) downwardly on the outside of the kiln, to the combustion chambers 25 (Figs. 1, 4, 5 and 6).

The velocity of the air and its temperature may both be controlled by means of adjustable draft devices 35, 37 (Figs. 1, 2 and 3) in the pipe 33. Each door 35 serves to open a Wall of the pipe 33 to atmosphere; each damper 37 serves to reduce the efiective cross-section of the pipe 33 at the point where the door 37 is located.

From the combustion chambers 25 the gaseous products of combustion pass into the kiln through a plurality of openings 41. These gases then pass upwardly through and in intimate contact with the ingredients of the charge in the kiln, and the gases leave the apparatus through the chimney 43 at the top.

The cold air is thus taken into heating chambers and is heated by conduction from within, through wall 31 (Fig. 4). The heated air then goes outside the kiln and down through pipes provided with draft devices, and then into the combustion chambers, where gas from the producers is burned.

This controlled pre-heating of the air facilitates the combustion of the gas, and helps to maintain the kiln at the temperature best suited for effective burning of the charge.

The temperature and velocity of the air passing to the combustion chamber is readily controlled by means (draft doors and fan) readily accessible'to the operator and protected from the intense heat of the kiln.

From the above it will be seen that the several objects of the invention are attained and other advantageous results achieved.

As many modifications of the embodiment above illustrated might be made Without departing from the spirit or scope of the present invention, it is intended that the above description and accompanying drawings and claims shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. In apparatus of the class described, in combination, a kiln combining a combustion chamber adjacent the lower part of the kiln, means for supplying fuel to said chamber, means for supplying air to said chamber, and means for heating said air prior to de livering it to said chamber, said third means comprising a heating chamber Within the Walls of the kiln above the combustion chamber, a conduit outside the kiln for conducting the heated air from the heating chamber down to the combustion chamber, means for controlling the Velocity of the air in said circuit, and another means in said circuit for controlling the temperature of said air independently of the velocity controlling means.

2. In apparatus of-the class described, in combination, a kiln combining a combustion chamber, means for supplying fuel to said chamber, means for supplying air to said chamber, means for heating said air prior to delivering it to said chamber, said last means comprising a heating chamber Within the Walls of the kiln, means outside the kiln for conducting the heated air from the heating chamber to the combustion chamber, means for controlling the velocity of the air, and other means for controlling the temperature of said air independently of the velocity controlling means.

In testimony whereof, I have signed my name to this specification this fifth day of October, 1923.

HEE RY F. GRUETZEMAGHER, 

